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mm: rewrite the comment over migrate_pages() more comprehensibly

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The comment over migrate_pages() looks quite weird, and makes it hard to
grasp what it is trying to say.  Rewrite it more comprehensibly.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Srivatsa S. Bhat 2013-04-29 15:08:16 -07:00 committed by Linus Torvalds
parent 52f37629fd
commit c73e5c9c59
1 changed files with 13 additions and 9 deletions
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22
mm/migrate.c
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@ -973,19 +973,23 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
}
/*
* migrate_pages
* migrate_pages - migrate the pages specified in a list, to the free pages
* supplied as the target for the page migration
*
* The function takes one list of pages to migrate and a function
* that determines from the page to be migrated and the private data
* the target of the move and allocates the page.
* @from: The list of pages to be migrated.
* @get_new_page: The function used to allocate free pages to be used
* as the target of the page migration.
* @private: Private data to be passed on to get_new_page()
* @mode: The migration mode that specifies the constraints for
* page migration, if any.
* @reason: The reason for page migration.
*
* The function returns after 10 attempts or if no pages
* are movable anymore because to has become empty
* or no retryable pages exist anymore.
* Caller should call putback_lru_pages to return pages to the LRU
* The function returns after 10 attempts or if no pages are movable any more
* because the list has become empty or no retryable pages exist any more.
* The caller should call putback_lru_pages() to return pages to the LRU
* or free list only if ret != 0.
*
* Return: Number of pages not migrated or error code.
* Returns the number of pages that were not migrated, or an error code.
*/
int migrate_pages(struct list_head *from, new_page_t get_new_page,
unsigned long private, enum migrate_mode mode, int reason)